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Sign in to savethumb|Logitech Cordless TrackMan Wheel trackball mouse thumb|250px|The original version of the Kensington Computer Products Group|Kensington Expert Mouse can use a US-size billiard ball as a trackball.
thumb|Logitech Cordless TrackMan Wheel trackball mouse thumb|250px|The original version of the Kensington Computer Products Group|Kensington Expert Mouse can use a US-size billiard ball as a trackball.